Preparation of La-Modified Lead Titanate Film Capacitors and Influence of SrRuO3 Electrodes on the Electrical Properties

材料科学 电容器 铁电性 电极 光电子学 薄膜电容器 电介质 激光烧蚀 激光器 电气工程 电压 光学 物理 工程类 物理化学 化学
作者
Takashi Nishida,Soichiro Okamura,Tadashi Shiosaki,S. Fujita,Yoichiro Masuda
出处
期刊:Japanese Journal of Applied Physics [Institute of Physics]
卷期号:38 (9S): 5337-5337 被引量:6
标识
DOI:10.1143/jjap.38.5337
摘要

SrRuO 3 electrodes are expected to dramatically improve the electrical properties of PbTiO 3 based ferroelectric film capacitors. Because of the good ferroelectricity and pyroelectricity of La-modified lead titanate (PLT), PLT film capacitors with SrRuO 3 and Pt electrodes were prepared. The PLT and SrRuO 3 films were prepared by YAG(YAG) laser ablation. YAG laser ablation has advantages over the conventional excimer laser ablation in running cost and safety. The dependence of ablation conditions on the composition and structure of PLT films obtained by the YAG laser ablation was revealed. The electrical properties of the capacitor with SrRuO 3 were compared with Pt. As a result, the low leakage current was successfully obtained from the capacitors with SrRuO 3 electrodes. Furthermore, little polarization fatigue occurred in a SrRuO 3 /PLT/SrRuO 3 capacitor after 10 10 switching cycles. The electrical properties of the capacitors with Pt and SrRuO 3 top electrodes are discussed. The dielectric property, D - E hysteresis curves and C - V characteristics were not affected by the top electrode material. However, it was found that the leakage current was significantly influenced by it. The results can be explained on the basis of the Schottky barrier that formed at the interface between the top electrode and the PLT layer. Based on these results, the conduction mechanism in PLT thin-film capacitors was investigated.
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